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Sometimes n represents the number of electrons in the half reaction, but other times it is the change in the moles throughout the reaction. Could it be either or is it really just one? If you are not told to find the half reactions of the redox equation, do you have to find them anyway to find n if the question is asking for the Gibbs Free Energy?
For that equation specifically "n" refers to the moles of electrons being transferred in the balanced redox reaction. So yes you will need to know that balanced value if asked for the Gibbs Free energy, which requires balancing the redox equation.
n will always be number of moles (of molecules, or in this case, e-). I think that it should be assumed that the value of n should be the number of electrons in the balanced equation, which could sometimes also be the same number in the half reaction.
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